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The output of greenhouse vegetables is high, the cycle is short, and several vegetables can be picked a year, so there must be sufficient fertilizer supplement. The total input of compound fertilizer per hectare of greenhouse vegetables is as high as 1500-2250 kg. The original greenhouse vegetables are mostly applied to nitrogen fertilizer, and the nitrogen fertilizer varieties are mainly used with ammonium sulfate, ammonium bicarbonate and urea, because the latter two fertilizers have high nitrogen concentration in the greenhouse, which is prone to ammonia poisoning, resulting in many leafy vegetables. The leaf blades become smaller and die, so the vegetable growers are less used for safety reasons. Long-term application of ammonium sulphate in greenhouse vegetables will bind the soil, destroy the soil structure and pollute the groundwater. In order to overcome the long-term application of ammonium sulphate, farmers use ammonium bicarbonate and urea instead of ammonium sulphate, but one season of vegetables should be fertilized 5-6 times, using less meals to overcome the ammonia volatilization, but caused human and financial resources. Waste. After the introduction of long-acting ammonium carbonate and long-acting urea, the vegetables used in greenhouses have brought good news to farmers. The use of the above two nitrogen fertilizer manufacturing and long-acting compound fertilizer is more ideal for vegetable production, and can obviously increase the yield. According to the test results of the vegetable base in Dalian, the greenhouse cucumber and greenhouse tomato were transplanted at a time of one-time base long-acting compound fertilizer 1800 - 1950 kg / ha. During the whole growth and fruit picking period of the crop, the former increased the yield of cucumber 9150 per hectare. In kilograms, the yield of tomato is increased to 11250 kg, which has a large economic benefit.
Vegetable soil testing and fertilization technology
The management of water and fertilizer in vegetables is the key to the high yield of vegetables. With the improvement of people's living standards and the development of the city, the variety, quantity, time to market and regulation of vegetables in the off-season are increasingly valued by people. The vegetable blue project has been raised to an important agenda for municipal construction. With the development of greenhouse vegetables, very seasonal vegetables have become a new independent vegetable system, which not only brings huge economic benefits to farmers, but also brings huge social benefits, and solves the difficulty of eating vegetables in the north in winter. The situation of the southern dish of the northern cuisine. For example, the construction of Shandong Shouguang vegetable base has greatly eased the vegetable supply market in Beijing and Tianjin. The development of greenhouse vegetables in Haicheng City, Liaoning Province has not only eased the vegetable market in major cities in the Northeast, but even exported to Russia. Due to the development of greenhouse vegetables, many towns and villages have emerged that have turned from poverty to wealth and poverty.
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